Electrical Machines
The synchronous motor can be started by

  coupling it with a DC compound motor.
  any of the above methods.
  providing damper winding in its rotor circuit.
  coupling it with a small AC induction motor called the pony motor.

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Electrical Machines
What is/are the necessary conditions for voltage build up in self excited generator?

 Field winding should be properly connected to armature winding.
All of these
 Field winding resistance should be less than critical resistance.
 Poles should contain residual flux.

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